Exam 4: Archaeal Cell Structure

The cell membranes of wall-less archaeons are strengthened by

Unlike members of the Bacteria,most archaeans have linear chromosomes.

In terms of membrane lipids,the plasma membranes of archaeons are more similar to those of the eukaryotes than to membranes of bacteria.

Archaeal membranes contain which of the following lipids?

Archaeal cell walls

Which type of membrane transport is most important for nutrient acquisition in nutrient poor environments?

Some archaeal cells lack a cell wall.

__________________ are hollow tube-like structures that hold some archaeal daughter cells together after cell division while____________ are grappling hook-like structures that appear to attach archaeal cells to surfaces.

Bacterial and archaeal ribosomes are known as _____ ribosomes,based on their sedimentation coefficient.

Which of the following is the most unique aspect of archaeon cell envelopes?

Methanogens may contribute to the greenhouse effect and global warming due to methane production.

Which of the following contribute(s)to the differences between the members of the Domain Archaea and the Domain Bacteria?

You are working with a newly described microorganism that has flagella that are solid,10 nm in diameter,and composed of more than one type of flagellin subunit.Based on the type of flagella,which type of organism is this?

_______ is a peptidoglycan-like molecule found in the cell walls of some archaea.

Penicillin inhibits bacterial growth by preventing the cross-linking during peptidoglycan synthesis.Why does penicillin not inhibit growth of archaeal cells?

A(n)__________ layer is a layer of protein or glycoprotein that exhibits a pattern resembling floor tiles.

Archaeons power their flagella by proton motive force (PMF),whereas bacteria empower their flagella by ATP hydrolysis.

Which cellular shape is seen among members of domain Bacteria that is not found among the domain Archaea?

The Archaea generally lack which of the following that are normally found in gram-negative bacteria?

Molecules or regions of molecules that readily interact with water are said to be __________,whereas molecules or regions of molecules that are insoluble in water or do not readily interact with water are said to be hydrophobic.